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MCP73837/8

Features

• High Accuracy Preset Voltage Regulation: + 0.5%

• Available Voltage Regulation Options:

- 4.20V, 4.35V, 4.4V, or 4.5V

• Complete Linear Charge Management Controller:

- Autonomous Power Source Selection

- Integrated Pass Transistors

- Integrated Current Sense

- Integrated Reverse Discharge Protection

• Constant Current (CC) / Constant Voltage (CV)

Operation with Thermal Regulation

• Selectable USB-Port Charge Current:

- Low: 1 Unit Load / High: 5 Unit Loads

• Programmable AC-Adapter Charge Current:

- 15 mA - 1000 mA

• Two Charge Status Outputs

• Power-Good Monitor: MCP73837

• Timer Enable: MCP73838

• Automatic Recharge:

- Selectable Voltage Threshold

• Automatic End-of-Charge Control:

- Selectable Charge Termination Current Ratio

- Selectable Safety Timer Period

• Preconditioning of Deeply Depleted Cells - Can

Be Disabled

• Battery Cell Temperature Monitor

• UVLO (Undervoltage Lockout)

• Automatic Power-Down when Input Power is

Removed

• Low-Dropout (LDO) Linear Regulator Mode

• Numerous Selectable Options Available for a

Variety of Applications:

- Refer to Section 1.0 “Electrical

Characteristics” for Selectable Options

- Refer to the “Product Identification

System” for Standard Options

• Temperature Range: -40°C to 85°C

• Packaging:

- 10-Lead 3 mm x 3 mm DFN

- 10-Lead MSOP*

* Consult Factory for MSOP package

availability.

Applications

• Smart Phones and Personal Data Assistants

(PDA)

• Portable Media Players (PMP)

• Ultra Mobile Devices (UMD)

• Digital Cameras

• MP3 Players

• Bluetooth Headsets

• Handheld Medical Devices

• AC/USB Dual Source Li-Ion Battery Chargers

Description

The MCP73837 and MCP73838 devices are fully

integrated linear Li-Ion / Li-Polymer battery chargers

with autonomous power source selection. Along with its

small physical size, the low number of external

components required makes the MCP73837/8 ideally

suitable for portable applications.

The MCP73837/8 automatically selects the USB-port

or AC-adapter as the power source for the system. For

the USB-port powered systems, the MCP73837/8

specifically adheres to the current limits governed by

the USB specification. The host microcontroller can

select from two preset maximum charge current rates

of 100 mA (low power USB-port) or 500 mA (high

power USB-port). With an AC-adapter providing power

to the system, an external resistor sets the magnitude

of the system or charge current up to a maximum of 1A.

The MCP73837/8 employs a constant current/constant

voltage charge algorithm with selectable

preconditioning and charge termination. The constant

voltage regulation is fixed with four available options:

4.20V, 4.35V, 4.40V, or 4.50V, to accommodate the

new emerging battery charging requirements. The

MCP73837/8 limits the charge current, based on die

temperature, during high power or high ambient

conditions. This thermal regulation optimizes the

charge cycle time while maintaining the device

reliability.

The MCP73837/8 are fully specified over the ambient

temperature range of -40°C to +85°C.

The MCP73837/8 devices are available in a 10-Lead,

3 mm x 3 mm, DFN package or in a 10-Lead MSOP

package.

Advanced Stand-Alone Li-Ion / Li-Polymer Battery Charge

Management Controller with Autonomous AC-Adapter or

USB-Port Source Selection

Summary of content (34 pages)

PAGE 1
MCP73837/8 Advanced Stand-Alone Li-Ion / Li-Polymer Battery Charge Management Controller with Autonomous AC-Adapter or USB-Port Source Selection Features Applications • High Accuracy Preset Voltage Regulation: + 0.5% • Available Voltage Regulation Options: - 4.20V, 4.35V, 4.4V, or 4.
PAGE 2
MCP73837/8 Package Types MCP73837/8 10-Lead MSOP MCP73837/8 10-Lead DFN 3 mm x 3 mm 10 VBAT VAC 1 10 VBAT VAC VUSB 2 9 THERM VUSB 2 9 THERM STAT1 3 8 PG (TE) STAT1 3 8 PG (TE) STAT2 4 7 PROG2 STAT2 4 7 PROG2 VSS 5 6 PROG1 VSS 1 5 6 PROG1 Typical Applications MCP73837 Typical Application 1 Ac-dc Adapter 4.7 µF 2 USB Port 4.7 µF 1 kΩ 1 kΩ 1 kΩ 3 4 8 VAC VBAT VUSB THERM STAT1 VSS STAT2 PROG2 PG PROG1 10 Thermsitor 9 4.
PAGE 3
MCP73837/8 Functional Block Diagram (MCP73837/8) VOREG DIRECTION CONTROL 6μA VBAT VUSB SENSEFET G=0.001 100mA/500mA 10k 2k SENSEFET G=0.001 VOREG DIRECTION CONTROL VAC AC/USB + SENSEFET G=0.001 1k VREF CURRENT LIMIT - SENSEFET G=0.001 PROG1 AC/USB REFERENCE, BIAS, UVLO, AND SHDN VOREG + VREF (1.21V) CA 310k 111k 10k + UVLO - 72.7k - PRECONDITION 470.6k + 48k TERM - PROG2 + STAT1 STAT2 CHARGE CONTROL, TIMER, AND STATUS LOGIC CHARGE 6k + VA - 157.
PAGE 4
MCP73837/8 1.0 ELECTRICAL CHARACTERISTICS † Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Absolute Maximum Ratings† VDDN .....................................................
PAGE 5
MCP73837/8 DC CHARACTERISTICS (Continued) Electrical Specifications: Unless otherwise indicated, all limits apply for VDD= [VREG(typical) + 0.3V] to 6V, TA = -40°C to +85°C. Typical values are at +25°C, VDD = [VREG (typical) + 1.0V] Parameters USB-port Fast Charge Current Maximum Output Current Limit Sym IREG IMAX Min Typ Max Units Conditions 80 90 100 mA PROG2 = Low 400 450 500 mA PROG2 = High TA=-5°C to +55°C — 1200 — mA PROG1 < 833Ω 12.
PAGE 6
MCP73837/8 DC CHARACTERISTICS (Continued) Electrical Specifications: Unless otherwise indicated, all limits apply for VDD= [VREG(typical) + 0.3V] to 6V, TA = -40°C to +85°C. Typical values are at +25°C, VDD = [VREG (typical) + 1.0V] Parameters Sym Min Typ Max Units Conditions Timer Enable (TE) Input High Voltage Level VIH 2 — — V Input Low Voltage Level VIL — — 0.8 V Input Leakage Current ILK — 0.
PAGE 7
MCP73837/8 AC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, all limits apply for VDD = [VREG (typical) + 0.3V] to 6V. Typical values are at +25°C, VDD = [VREG (typical) + 1.0V] Parameters Sym Min Typ Max Units tSTART — — 5 ms VDD Low to High tDELAY — — 10 ms VBAT < VPTH to VBAT > VPTH tRISE — — 10 ms IOUT Rising to 90% of IREG Precondition Comparator Filter Time tPRECON 0.4 1.3 3.2 ms Average VBAT Rise/Fall Termination Comparator Filter Time tTERM 0.
PAGE 8
MCP73837/8 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
PAGE 9
MCP73837/8 90 5.0 5.3 5.5 Supply Voltage (V) 5.8 FIGURE 2-8: Charge Current (IOUT) vs. Supply Voltage (VDD). 1100 RPROG = 1 kΩ VDD = 5.2V Charge Current (mA) 1050 1000 950 900 850 800 750 700 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 Ambient Temperature (°C) FIGURE 2-9: Charge Current (IOUT) vs. Ambient Temperature (TA). © 2007-2011 Microchip Technology Inc. -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 Ambient Temperature (°C) 6.0 FIGURE 2-11: Charge Current (IOUT) vs. Ambient Temperature (TA).
PAGE 10
MCP73837/8 52.0 51.5 51.0 50.5 50.0 49.5 49.0 48.5 48.0 47.5 47.0 90 80 70 60 50 40 30 20 0 FIGURE 2-16: Thermistor Current (ITHERM) vs. Ambient Temperature (TA). 0 RPROG = 10 kΩ Attenuation (dB) -10 IOUT = 10 mA COUT = 4.7 µF -20 -30 -40 -50 -70 0.01 155 145 135 125 115 105 95 85 75 65 55 45 35 25 -60 0.1 1 FIGURE 2-14: Charge Current (IOUT) vs. Junction Temperature (TJ). 52.0 51.5 51.0 50.5 50.0 49.5 49.0 48.5 48.0 47.5 47.
PAGE 11
MCP73837/8 700 600 500 400 300 200 100 0 -100 -200 Time (Minutes) Time (µs) FIGURE 2-19: 0 12 -0.1 10 8 -0.2 VIN 6 -0.3 4 -0.4 2 FIGURE 2-22: Load Transient Response. 0.1 VOUT 14 Input Source (V) Line Transient Response. VIN Output Ripple (V) 16 0.1 0.05 0 -0.05 -0.1 -0.15 -0.2 -0.25 -0.3 1.6E-03 -0.5 1.4E-03 0 1.2E-03 IOUT = 100 mA -4.0E-04 -0.4 2 1.0E-03 4 IOUT 8.0E-04 -0.3 6.0E-04 -0.2 VIN 6 4.0E-04 8 2.0E-04 -0.1 10 IOUT = 100 mA VOUT 0.
PAGE 12
MCP73837/8 Note: Unless otherwise indicated, VDD = [VREG(typical) + 1V], IOUT = 30 mA and TA= +25°C, Constant-voltage mode. UVLOVAC Battery Voltage (V) VOUT 0.12 VOUT 0.1 4.0 0.08 3.0 0.06 IOUT 2.0 0.04 VDD = 5.2V RPROG = USB_Low 180 mAh Li-Ion Battery 1.0 0.02 0.0 Charge Current (A) 5.0 VIN 0 0 20 40 60 80 100 120 140 160 180 Time (Minutes) 4.0 1.2 5.0 1 4.0 0.8 3.0 IOUT 0.6 2.0 0.4 VDD = 5.2V RPROG = 1 kΩ 1200 mAh Li-Ion Battery 1.0 0.06 C.V. Begins 2.0 0.04 VDD = 5.
PAGE 13
MCP73837/8 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1.
PAGE 14
MCP73837/8 3.8 USB-Port Current Regulation Set (PROG2) The MCP73837/8 USB-port current regulation set input (PROG2) is a digital input selection. A logic Low selects a 1 unit load charge current; a logic High selects a 5 unit loads charge current. The precondition and termination current is internally set to the percentage levels selected by the device part number. The current is based upon the selected unit load charge current based upon the level of PROG2.
PAGE 15
MCP73837/8 4.0 DEVICE OVERVIEW The MCP73837/8 devices are simple, yet fully integrated linear charge management controllers. Figure 4-1 depicts the operational flow algorithm.
PAGE 16
MCP73837/8 4.1 Undervoltage Lockout (UVLO) An internal undervoltage lockout (UVLO) circuit monitors the input voltage and keeps the charger in Shutdown mode until the input supply rises above the UVLO threshold. The UVLO circuitry has a built-in hysteresis of 75 mV for the USB-port and 55 mV for the AC-adapter. In the event a battery is present when the input power is applied, the input supply must rise 100 mV above the battery voltage before MCP73837/8 becomes operational.
PAGE 17
MCP73837/8 remains until a battery is reinserted or the PROG1/2 pin is reconnected. If the input power is removed, the MCP73837/8 is in Shutdown. When the input power is reapplied, a normal start-up sequence ensues. 4.6 Constant Voltage Mode When the voltage at the VBAT pin reaches the regulation voltage, VREG, constant voltage regulation begins. The regulation voltage is factory set to 4.20V, 4.35V, 4.40V, or 4.5V with a tolerance of ± 0.5%. 4.7 Charge Termination 4.
PAGE 18
MCP73837/8 5.0 DETAILED DESCRIPTION 5.1 Analog Circuitry 5.1.1 BATTERY MANAGEMENT INPUT SUPPLY (VDD) The VDD input is the input supply to the MCP73837/8. The MCP73837/8 can be supplied by either ACadapter (VAC) or USB-port (VUSB) with autonomous source selection. The MCP73837/8 automatically enters a Power-down mode if the voltage on the VDD input falls to within +100 mV of the battery voltage or below the UVLO voltage (VSTOP).
PAGE 19
MCP73837/8 5.2.2 USB-PORT CURRENT REGULATION SELECT (PROG2) For the MCP73837/8, driving the PROG2 input to a logic Low selects the low charge current setting (maximum 100 mA). Driving the PROG2 input to a logic High selects the high charge current setting (maximum 500 mA). The Precondition current and Termination current are percentages of the charge current selected by the PROG2 level. The percentage is based upon the selected part number of the device.
PAGE 20
MCP73837/8 6.0 APPLICATIONS Lithium-Polymer cells Constant-current followed by Constant-voltage. Figure 6-1 depicts a typical standalone MCP73837 application circuit, while Figure 6-2 and Figure 6-3 depict the accompanying charge profile. The MCP73837/8 devices are designed to operate in conjunction with a host microcontroller or in standalone applications.
PAGE 21
MCP73837/8 EQUATION 6-1: PowerDissipation = ( V DDMAX –V PTHMIN )×I REGMAX Where: VDDMAX = the maximum input voltage IREGMAX = the maximum fast charge current VPTHMIN = the minimum transition threshold voltage For example, power dissipation with a 5V, ±10% input voltage source and 500 mA, ±10% fast charge current is: EXAMPLE 6-1: Placing a programming resistor from the PROG1 input to VSS or driving PROG2 to logic High or Low enables the device.
PAGE 22
MCP73837/8 7.0 PACKAGING INFORMATION 7.1 Package Marking Information 10-Lead DFN 1 2 3 4 Part Number * 10 XXXX XYWW NNN 5 9 8 7 6 Marking Code Part Number * Marking Code MCP73837-FCI/MF BABA MCP73837T-FCI/MF MCP73837-FJI/MF BABB MCP73837T-FJI/MF MCP73837-NVI/MF BABC MCP73837T-NVI/MF MCP73838-FCI/MF BACA MCP73838T-FCI/MF MCP73838-FJI/MF BACB MCP73838T-FJI/MF MCP73838-NVI/MF BACC MCP73838T-NVI/MF * Consult Factory for Alternative Device Options.
PAGE 23
MCP73837/8 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging © 2007-2011 Microchip Technology Inc.
PAGE 24
MCP73837/8 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS22071B-page 24 © 2007-2011 Microchip Technology Inc.
PAGE 25
MCP73837/8 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging © 2007-2011 Microchip Technology Inc.
PAGE 26
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PAGE 27
MCP73837/8 10-Lead Plastic Micro Small Outline Package (UN) [MSOP] Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging © 2007-2011 Microchip Technology Inc.
PAGE 29
MCP73837/8 APPENDIX A: REVISION HISTORY Revision B (December 2011) The following is the list of modifications: 1. 2. 3. 4. 5. 6. Updated the Functional Block Diagram on page 3. Added labels on the charts throughout Section 2.0 “Typical Performance Curves”. Updated text in Section 3.8 “USB-Port Current Regulation Set (PROG2)”. Updated text in Section 4.4 “Preconditioning”. Updated text in Section 5.2.2 “USB-Port Current Regulation SeLect (PROG2)”. Added labels in Figure 6-2 and Figure 6-3.
PAGE 31
MCP73837/8 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device XX X/ Examples: * * XX Output Temp.
PAGE 33
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 34
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